Abstract: A combustion control system for a burner having an analog circuit unit which includes a photosensor for detecting combustion flame of the burner, an amplifier for amplifying a detection output from the photosensor, a rectifier for rectifying the amplified signal to a DC component, and an integrator for smoothing the rectified signal to obtain an oscillating power signal.

Abstract: A combustion control apparatus for a burner comprising a detector for detecting an ionic current in a flame from the burner or light power of the flame, which changes in accordance with a change of combustion condition of the flame, and outputting an electric signal corresponding to the detected ionic current or light power, and an electric circuit supplied with the signal output from the detector to generate an output for maintaining a predetermined combustion condition on the basis of a reference value previously set therein and deliver the output to a controller for fuel and air systems of the burner.